class Optional extends AbstractType<Output | undefined>import { Optional } from "https://deno.land/x/valita@v0.2.10/mod.ts"; ConstructorsnewOptional(type: AbstractType<Output>)Type ParametersoptionalOutput = unknownPropertiesreadonlyname: stringMethodsfunc(v: unknown, mode: FuncMode): RawResult<Output | undefined>optional(): Optional<Output>toTerminals(func: (t: TerminalType) => void): void